Auricular peripheral nerve field stimulator and method of operating same

ABSTRACT

An auricular peripheral nerve field stimulator includes at least one therapy electrode configured for percutaneous insertion into an auricle of a human ear near at least one neurovascular bundle, and an electrical stimulation device electrically coupled to the at least one therapy electrode, the electrical stimulation device programmed to generate and deliver electrical stimulation signals, with defined stimulation parameters, to the percutaneously inserted at least one therapy electrode to stimulate at least one auricular peripheral nerve field within the auricle, the defined stimulation parameters including a defined signal amplitude, a defined pulse frequency, a defined pulse width, a defined duty cycle and a defined stimulation signal duration.

CROSS-REFERENCE TO RELATED APPLICATIONS

This patent application is a continuation of U.S. patent applicationSer. No. 16/408,004, filed May 9, 2019, which is a continuation of U.S.patent application Ser. No. 16/014,169, filed Jun. 21, 2018, which is acontinuation of U.S. patent application Ser. No. 15/811,278, filed Nov.13, 2017 and now U.S. Pat. No. 10,010,479, which is a continuation ofU.S. patent application Ser. No. 15/595,185, filed May 15, 2017 and nowU.S. Pat. No. 9,839,577, which is a continuation of U.S. patentapplication Ser. No. 14/277,158, filed May 14, 2014 and now U.S. Pat.No. 9,662,269, which claims the benefit of, and priority to, U.S.Provisional Patent Application Ser. No. 61/894,270, the disclosures ofwhich are all incorporated herein by reference in their entireties.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The field of art disclosed herein pertains to an electrical stimulationdevice including a stimulator containing a generator for generatingelectrical stimulation pulses with defined stimulation parameters and apower supply for supplying the generator with electrical energy, and atleast one needle electrode array for insertion into the skin surface ofan area to be stimulated.

2. Description of the Related Art

An electrical stimulation device of the present type is, for instance,known from AT 395 106 B and EP 1 335 774 B1. The electrical stimulationdevices are used in the electrical acupuncture therapy of humans andanimals. Often, the devices are suitable for using the electricalstimulation of acupuncture points in the region of the ear. Applicationsrange from pain management to wound healing, to therapies of circulatorydisorders, e.g. in diabetes.

Placement of acupuncture needles, both electrically and non-electricallystimulated in the auricular (ear) anatomy has been used for pain controlfor decades. The theory for effectiveness of acupuncture has been basedupon theories, which include energy flow (chi), application of heat orcold and the use of reflex points.

The actual location and determination of needle placement (calledpoints) is based upon tradition and theory of acupuncture. While theascribed “points” may vary, depending upon the type of acupuncture towhich one prescribes, the rationale and needle placement varies littleand the theory is the same.

The addition of electrical stimulation to the individual, non-connectedneedles does not alter the rationale and the location of application isstill based upon the original theory. The addition of electricity, whileconsidered an enhancement, still falls within the realm of auricularacupuncture.

Peripheral nerve field stimulation is an accepted procedure for theaffecting of targeted nerves to alter pain transmission on a local(peripheral) and CNS (central nervous system) level. PNFS is commonlyused in the occipital nerves (branches of the cervical nerves) forheadache control, and the femoral nerve of the leg for control ofphantom limb pain, stump pain, and other types of pain, including preand post surgical pain and acute and chronic pain.

The PNFS technique is based upon neuro-anatomy, blood vessel anatomy,the proximity of the electrodes to the actual nerves being stimulatedand verification of electrode proximity.

Located within the ear are cranial nerves V, VII, IX, X which anastomose(connect) directly into the brain and branches of the greater and lesseroccipital nerves anastomosing directly into the cervical spine. Thereare distinct areas of the auricle on both the dorsal and ventral aspectwhich carry a predominance/concentration of the cranial nerves,peripheral nerves, arterial branches, and neurovascular bundles.

Branches of the superior temporal artery and the posterior auricularartery are found within the external ear, entering from the anterior(ventral) and posterior (dorsal) aspect of the ear. These arteriesconverge in the lobe, branching eventually into the cellular levelforming a complex, interconnecting network branching according toMandelbrot's set.

The present invention provides for a system and methods not based uponacupuncture technique or “points” but rather peripheral nerve fieldstimulation, anatomical location of cranial nerves, peripheral nerves,arterial branches and/or neurovascular bundles, and energy transferbased upon accepted laws of energy transfer in human tissue. Thesephysical entities can be selectively targeted by percutaneousimplantation of one or more electrode-needle complex either with asingle needle or an array connected to a generator set at a selectedfrequency or modulating frequency range.

BRIEF DESCRIPTION OF THE DRAWINGS

The various exemplary embodiments of the present invention, which willbecome more apparent as the description proceeds, are described in thefollowing detailed description in conjunction with the accompanyingdrawings, in which:

FIG. 1A is a side view of a head of a human being with an electricalstimulation device in an auricular application, according to oneembodiment;

FIG. 1B is a block diagram of the electrical stimulation device of FIG.1B, according to one embodiment;

FIG. 2 is a perspective view of an electrode needle array of theelectrical stimulation device of FIG. 1 ;

FIG. 3 is a perspective view of a single therapy electrode and line ofthe electrode needle array of FIG. 2 , according to one embodiment;

FIG. 4 is a front side view of the electrode needle array of FIG. 2 ,according to one embodiment;

FIG. 5 is a back side view of the electrode needle array of FIG. 2 ,according to one embodiment;

FIG. 6 is a front side view of the single therapy electrode and line ofFIG. 3 , according to one embodiment;

FIG. 7 is a right side view of the single therapy electrode and line ina cross section view along lines A-A of FIG. 3 , according to oneembodiment;

FIG. 8 is a front side view of the single therapy electrode and line ofFIG. 3 , according to one embodiment;

FIG. 9 is a right side view of the single therapy electrode and line ina cross section view taken along lines B-B of FIG. 8 , according to oneembodiment;

FIG. 10 is a right side detail view of the single therapy electrode ofFIG. 9 , according to one embodiment;

FIG. 11 is a top view of the single therapy electrode of FIG. 8 in crosssection view taken along lines C-C, according to one embodiment;

FIG. 12 is a perspective view of the single therapy electrode of FIG. 3, according to one embodiment;

FIG. 13 is a side view of the single therapy electrode of FIG. 3 with aline port illustrated in phantom, according to one embodiment;

FIG. 14 is a side view of the single therapy electrode of FIG. 13 incross section view taken along lines D-D, according to one embodiment;

FIG. 15 is a side view of the single therapy electrode of FIG. 13 incross section view taken along lines E-E, according to one embodiment;

FIG. 16 is a side view of the single therapy electrode of FIG. 13 from aperspective of line F, according to one embodiment; and

FIG. 17 is a flow diagram of a method of electrical stimulation usingthe electrical stimulation device of FIG. 1 , according to oneembodiment.

DETAILED DESCRIPTION

The present invention relates to methods and systems for electrodeplacement for auricular peripheral nerve field stimulation (PNFS) usinga unique method of anatomical visualization and percutaneousimplantation of an electrode complex(s) designed as a needle array.

In one embodiment, the invention providers for a single use device thatis physician applied for ambulatory, continuous, home based therapy. Inone embodiment, the stimulator is percutaneously implanted into thecranial and/or peripheral nerves and corresponding neural vascularbundles of the auricular and periauricular areas as ascertained by themethod of evaluating and implanting of the electrode/needle arrayprovided in the present invention. This includes transillumination ofthe auricular and periauricular tissues and surrounding neurovascularanatomy. The auricular peripheral nerve stimulator system allows forcontinuous, intermittent neural stimulation.

In one embodiment, the auricular peripheral nerve stimulator system is abattery-operated, single-use device that has a preprogrammed frequency,pulse and duration for the stimulation of selected cranial and/orperipheral nerves and corresponding neural vascular bundles of auricularand periauricular areas. In one embodiment, the device power supplyconnects via three or more electrical conduit wires, sheathed inelectrically insulating material, to one or more therapy electrodearrays comprised of multiple needles each and one reference electrode.

In another embodiment, the device comprises two or more needle arrayscomprised of multiple needles each. In another embodiment, the devicecomprises three or more needle arrays comprised of multiple needleseach. In another embodiment, the device comprises four or more needlearrays comprised of multiple needles each. In another embodiment, theneedle arrays are comprised of two or more needles each. In anotherembodiment, the needle arrays are comprised of three or more needleseach. In another embodiment, the needle arrays are comprised of four ormore needles each. In another embodiment, the needle arrays arecomprised of five or more needles each. In another embodiment, theneedle arrays are comprised of six or more needles each.

Turning to the drawings, FIGS. 1A-1B depict an electrical stimulationdevice 10 for, in particular, an electrical acupuncture therapy in theregion of an ear 12 of a human being 14. The stimulation device 10includes a stimulator 18 containing a generator 20 for generatingstimulation pulses with defined stimulation parameters, i.e. a definedvoltage or a defined current, a defined duration, a defined repetitionfrequency and a defined duty cycle etc. In one embodiment, theelectrical stimulation device 10 comprises an electrical signalgenerator 20 configured to generate electrical stimulation pulses havinga repetition frequency of 0.5 to 100 Hz, preferably 1-10 Hz, and a dutycycle of 10 to 90%, preferably 40-60%. In one embodiment, thestimulation pulses are generated at a constant current amplitude.

With particular reference to FIG. 1B, electronic aspects of theelectrical stimulation device 10 may be implemented by means of ananalogue circuit, a digital circuit or a computer arrangement with aprocessor instructed by a suitable computer program, or any combinationthereof. In one embodiment, a program 22 for performing stimulation isresident in memory 24 and executed by a microprocessor 26 to control thestimulator 18. The memory 24 may be implemented as several memory unitsof different types (RAM, ROM, etc.). The memory 24 stores instructionsof a program 22 to allow a microprocessor 26 to perform one or morefunctions. Optionally, memory 24 stores a number of detected parametervalues as obtained from detection devices 28, such as incorporated in anelectrode needle array 30. The memory 24 may be any suitable memory 24for storing a predetermined function such as a computer readable memory24. The predetermined function may be a mathematical function orcorrelation. Suitable functions may be functions that are suitable fordetermining whether a determined parameter value is equal to, greaterthan or smaller than a predetermined threshold value. Based on hisknowledge the skilled person will be able to determine suitablefunctions on the basis of which a response is required as a function ofthe determined parameter values. For example, the function may relatethe absence of certain parameter values below a certain threshold valueto a certain time frame. Such a function may be determined to detect theabsence of breathing during a certain time period e.g. 1 second andlonger, 2 seconds and longer or 5 seconds and longer.

Based on the program 22 as stored in the memory 24, the microprocessor26 is able to process the number of detected parameter values asobtained from the detection device in said function. For this, thedetected parameter values are loaded into the microprocessor 26 eitherdirectly from the detection devices 28 or alternatively from the memory24 into which the detected parameter values were previously loaded. Thefunction is loaded in the microprocessor 26 from the memory 24 or in analternative embodiment the predetermined function may be embedded insaid microprocessor 26. In the latter embodiment at least one memory 24is (partially) integrated in the microprocessor 26. In one embodiment,the memory 24 records the stimulation parameters as a function of timeas data 25 to enable the performance of a quality control check or checkof the proper operation by a remote control device 27 that isperiodically or permanently in communication with the stimulation device10 via wireless or wired connection 29.

The detection device 28 may be any suitable device for detecting anumber of parameter values. In the present specification, a “number”shall mean one or more unless explicitly stated otherwise. Parameterssuitable for determining whether a subject is in need of resuscitationinclude but are not limited to parameters corresponding to muscleactivity, parameters corresponding to breathing, or parameterscorresponding to cerebral activity, such as electrical activity ofneural cells including brain cells, or electrical activity recorded fromthe ear or any other suitable point on the body of a human being 14.Other sensors may be applied as well, like a sensor to measure bodytemperature, a sensor to measure pressure, and a sound sensor, like amicrophone.

A power supply 32 is provided in order to supply the components of thestimulator 18 with electrical energy. In one embodiment, the powersupply 32 is formed by a suitable battery 34 or an accumulator. Theelectrical pulses generated in the generator 20 of the stimulator 18 aredelivered via at least one needle electrode array 30 comprising at leasttwo therapy electrode arrays 36 and at least one ground or referenceelectrode 38.

Each therapy electrode 36 has two or more needle electrodes 40, which inan exemplary embodiment is four (4) in number. In one embodiment, thenumber of therapy electrodes 36 is selected from the group consisting of2, 3, 4, 5, 6, 7, 8, 9, 10, or more. In another embodiment, the numberof needle electrodes 40 per therapy electrode 36 is selected from thegroup consisting of 2, 3, 4, 5, 6, 7, 8, 9, 10, or more. In oneembodiment, the number of needle electrodes 40 per therapy electrode 36is 2-10. In one embodiment, the number of needle electrodes 40 pertherapy electrode 36 is 3-9. In one embodiment, the number of needleelectrodes 40 per therapy electrode 36 is 4-8. As seen in FIG. 1B, thearray may include one or more therapy electrode 36′ and 36″, alone or incombination, with five (5) and six (6) needle electrodes 40,respectively.

The present invention has shown that the use of therapy electrode 36having a plurality of two or more needle electrodes 40—and preferably 3or more and more preferably 4 or more—provides for the unexpected resultof a synergistic field effect and not merely an additive electricalstimulation for pain reduction.

Each reference electrode 38 includes at least at least one needleelectrode 40. The therapy electrodes 36 and reference electrode 38 areinserted into the skin surface in the area to be stimulated. Thereference electrode 38 provides a ground connection for electroniccircuit located within the stimulator 18.

In one embodiment, the needle electrodes are made of an electricallyconductive material, in particular a metal such as titanium, stainlesssteel or the like. In addition to metals, conductive synthetics are alsoconceivable for the production of the needle electrodes.

In one embodiment, the at least two needle electrodes 40 of the therapyelectrode 36 are arranged in a common electrode housing 42 with adetection device 28 and connected to the stimulator 18 by an appropriateline 44. A circuit board 45 (FIG. 1B) on which the one or more needleelectrodes 40 are mounted is arranged in the common electrode housing42. The therapy electrodes 36 can, for instance, be simply connected tothe circuit board 45 by a conductive adhesive. The line 44 is likewiseconnected to the circuit board 45, either by a solder joint or by ascrew connection, the conductive tracks of the circuit board 45safeguarding the electrical connection to the therapy electrodes 36. Thearrangement of each therapy electrode 36 in a common electrode housing42 provides for a defined distance between the individual needleelectrodes 40. The line 44 for connecting the therapy electrodes 36 tothe stimulator 18 can be fixedly, i.e. inseparably, or even detachablyconfigured. Each line 44 can be fixedly connected respectively to thecorresponding therapy electrode 36 or reference electrode 38. Each line44 can also be fixedly connected to the stimulator 18. In theillustrative embodiment, each line 44 terminates at a plug 46 that isphysically and electrically connected to a socket 48 mounted on anelectronic housing 50 that contains the stimulator 18.

In order to attach the electronic housing 50 to the skin surface, afastening element 54 (FIG. 1B), such as an adhesive element, may beprovided. Besides the adhesive element, other fastening methods, e.g.via magnets, elastic bands or the like can be used. The fasteningelement can be integrated in the electrode housing. For example, theelectronic housing 50 can adhesively mount behind the ear 12 of thehuman being 14 (FIG. 1A). The electronic housing 50, which may be madeof a synthetic material and is preferably designed to be water-proof.The components depicted in FIG. 1A can be arranged in a preferablysterile package (not illustrated) so as to prevent any contamination ofthe needle electrode array 30.

The present invention provides an electrical stimulation system thatprovides unexpected results in terms of performance and efficacy. In oneaspect, the present disclosure provides an electrical stimulation device10 with a stimulator 18 containing a generator 20 for generatingelectrical stimulation impulses with defined stimulation parameters, anda power supply 32 for supplying the generator 20 with electrical energy,and with at least two needle electrodes 40 for insertion into the skinsurface of an area that is to be stimulated.

In another aspect, the present disclosure provides an apparatus forstimulating auricular points on the human ear is provided using lowvoltage pulses that are generated and delivered by portions of theapparatus, particularly by percutaneously implanted needle electrodesinto the cranial and/or peripheral nerves and corresponding neuralvascular bundles of the auricular and periauricular areas.

In another aspect, methods of evaluating and implanting of theelectrode/needle array include transillumination of the auricular andperiauricular tissues and surrounding neurovascular anatomy.

Where the control device is coupled to operating elements for changingthe stimulation parameters, manual adjustment and change of thestimulation parameters may be provided. Where no operating elements areprovided, the respective adjustment of the stimulation parameters can beperformed by programming the control device. To this end, the stimulatorpreferably comprises a suitable interface for connecting to a controlcomputer.

An actuator or switch can be provided to activate the stimulator.Alternatively, the activation can, for instance, also be realized byremoving an insulator on the battery 34 constituting the power supply32.

In order to give a feedback on the operation of the stimulation deviceto the patient or the physician, an operation indicator 52, e.g. alight-emitting diode, can be provided in the stimulator. In addition toan optical operation indicator, an acoustic indicator of the properoperation or proper start-up can also be provided.

In another embodiment, the auricular peripheral nerve stimulator systemis a battery-operated, single-use device that has a pre-programmedfrequency, pulse and duration for the stimulation of selected cranialand/or peripheral nerves and corresponding neural vascular bundles ofauricular and periauricular areas. The power supply 32 connects via fourlines 44 of stainless steel wires, sheathed in a plastic overmolding, tothree therapy electrodes 36 comprised of four (4) needle electrodes 40each and one reference electrode 38 comprised of only one (1) needleelectrode 40.

In another embodiment, the auricular peripheral nerve stimulator is asingle use device that is physician applied for ambulatory, continuous,home based therapy. It is to be percutaneously implanted into thecranial and/or peripheral nerves and corresponding neural vascularbundles of the auricular and periauricular areas as ascertained by thedisclosed method of evaluating and implanting of the electrode/needlearray. This includes transillumination of the auricular andperiauricular tissues and surrounding neurovascular anatomy. Theauricular peripheral nerve stimulator system allows for continuous,intermittent neural stimulation for up to five days.

In another embodiment, the device is an ambulatory, physician applied,minimally invasive application of electrical neural stimulationimplanted directed into the neurovascular bundles of the external earverified by transillumination co joined with skin impedance measurement.In another embodiment, a generator located behind the ear, produceselectrical stimulation impulses, which are transferred via anelectrode/needle array to branches of cranial and/or occipital nervesand sympathetic fibers of the arterial branches.

In another embodiment, electrode/needle array implantation into the skinof the ear allows for direct access to branches of cranial nerves V,VII, IX, and X as well as branches of the occipital nerves. Directaccess to the arterial branches of the head and neck are accessible andreduction of sympathetic stimulation results in an increase of vascularflow rate, reduction of vascular resistance and increase of perfusion.The arterial branches of the superficial temporal artery and theposterior auricular artery form a rich interconnecting complex networkthe terminal branches of which anastomose throughout the ear.

In another embodiment, the auricular peripheral nerve stimulator altersproduction and utilization of serotonin via vagal stimulation, andmeningovascular dilation secondary to decreased sympathetic (orincreased parasympathetic) tone.

In one embodiment, the device is powered by three lithium batteries,each with a voltage of 3 volts. In another embodiment, the devicemodulates a duty cycle between 2 hours on, 2 hours at rest. In anotherembodiment, the maximum performance time frame is 5 days or 120 hours (5days×24 hours).

In another embodiment, the auricular peripheral nerve stimulator is asingle use device that is physician applied for ambulatory, continuous,home based therapy. In another embodiment, it is to be percutaneouslyimplanted into the cranial and/or peripheral nerves and correspondingneural vascular bundles of the auricular and periauricular areas asascertained by the disclosed methods of evaluating and implanting of theelectrode/needle array. The methods include transillumination of theauricular and periauricular tissues and surrounding neurovascularanatomy. In another embodiment, the auricular peripheral nervestimulator system allows for continuous, intermittent neural stimulationfor up to five days.

In one embodiment, the generator 20 for generating electricalstimulation pulses is comprised of a digital/analog converter (DAC) 56and a voltage/current converter (VCC) 58. The therapy electrodes 36 areconnected to the stimulator 18 via lines 44. The power supply 32 ispreferably formed by a battery 34. The actuation of the generator 20,and the fixation of the stimulation parameters and control of thestimulation procedure, are effected via a control device, such as themicroprocessor 26. The microprocessor 26 can be programmed, and itsparameters can be changed, via an interface 60. A change in thestimulation parameters can also be effected manually by the aid ofappropriate operating elements 62 coupled to the microprocessor 26either on the electronic housing 50 or in the remote control device 27.The current amplitude of the stimulation pulses can, for instance, beadjusted and changed via operating elements 62, e.g. buttons. Activationof the stimulator 18 and the power supply 32 provided therein can beeffected via a switch 64. In accordance with the invention, stimulationpulses are delivered to the lines 44 connected to the therapy electrodes36 at constant current amplitudes in order to be more independent of thestrongly varying impedance of the skin.

The stimulator 18 can store the stimulation parameters as data 25 inmemory 24 as a function of time for subsequent examinations or forquality control. The memory 24 can be read out by an appropriatecomputer such as the remote control device 27 via the interface 60. Toindicate the proper functioning of the electrical stimulation device 10and the stimulator 18, respectively, an appropriate operation indicator52 can be provided, which may, for instance, be formed by alight-emitting diode.

In some embodiments of the invention, the electrical stimulation device10 comprises controls for the ability to adjust the voltage output tothe therapy electrodes 36 by manipulation of controls. It iscontemplated that in some instances the healthcare professional may wishto make changes to the voltage output to the devices of the presentinvention, such as the pulse frequency, the pulse width, the provisionof sequential pulses, the output of more than one pulse at a time andthe like. In one embodiment, variations in the operation of device aremade using a serial interface. The term “serial interface” as usedherein refers to device that may be coupled to the electronic circuitvia an electrical port and to a computer or the like having softwarecapable of being downloaded to the microprocessor 26 of the circuit.Once downloaded to the microprocessor 26, such software, such as program22, would control the voltage output to the therapy electrodes 36, asdesired.

The electrical stimulation device 10 can be operated for auricular useas follows. Initially, auricular points on the outer part of the ear 12are identified depending upon the symptoms or other conditions of aparticular patient. It should be appreciated that one skilled in the artcan identify auricular points and/or their correlation with differenthealth. Once such points are identified by a health care professional,the device of this invention is employed to deliver a pulsed voltage tosuch points.

FIG. 2 illustrates the electrode needle array 30 of the electricalstimulation device 10 of FIG. 1 .

FIG. 3 illustrates a single therapy electrode 36 and line 44 of theelectrode needle array 36 of FIG. 2 .

FIG. 4 illustrates the electrode needle array 30.

FIG. 5 illustrates a back side view of the single therapy electrode 36.

FIG. 6 illustrates front side view of the single therapy electrode 36and line 44.

FIG. 7 illustrates a right side view of the single therapy electrode 36and line 44 in a cross section view along lines A-A of FIG. 3 .

FIG. 8 illustrates a front side view of the single therapy electrode 36and line 44.

FIG. 9 illustrates a right side view of the single therapy electrode 36and line 44 in a cross section view taken along lines B-B of FIG. 8 .

FIG. 10 illustrates a right side detail view of the single therapyelectrode 36 of FIG. 9 .

FIG. 11 illustrates a top view of the single therapy electrode 36 ofFIG. 8 in cross section view taken along lines C-C, according to oneembodiment;

FIG. 12 illustrates a perspective view of the single therapy electrode36 of FIG. 3 , according to one embodiment;

FIG. 13 illustrates a side view of the single therapy electrode 36 ofFIG. 3 with a line port 66 illustrated in phantom, according to oneembodiment.

FIG. 14 illustrates a side view of the single therapy electrode 36 ofFIG. 13 in cross section view taken along lines D-D, according to oneembodiment.

FIG. 15 illustrates a side view of the single therapy electrode 36 ofFIG. 13 in cross section view taken along lines E-E, according to oneembodiment.

FIG. 16 illustrates a side view of the single therapy electrode 36 ofFIG. 13 from a perspective of line F, according to one embodiment.

FIG. 17 illustrates a method 1700 of electrical stimulation using theelectrical stimulation device 10 (FIG. 1 ). In one embodiment, themethod 1700 includes the processor of the electrical stimulation devicebeing awoken by a timer interrupt (block 1702). The processor checks atotal run time (block 1704). As discussed below, the processordetermines what state is appropriate for the current run time bychecking state in block 1706. For example, the processor can prompt thegenerator to produce a 1 Hz positive pulse (block 1708). The processorcan prompt the generator to produce a 10 Hz positive pulse (block 1710).The processor can prompt the generator to produce a 1 Hz negative pulse(block 1712). The processor can prompt the generator to produce a 10 Hznegative pulse (block 1714). The processor can determine that a delaytimer has expired and restart time (block 1716) or the processor candelay of two hours is warranted (block 1718). Then the processor canincrement an EEPROM counter if necessary (block 1720).

In one embodiment, the auricular peripheral nerve stimulator placementmethod comprises the steps:

a) In some embodiments, the electrode/needle harness will be attached tothe generator activating the device. Confirmation of successfulactivation may be tested by use of the provided ohmmeter to assure thecircuit is complete.

b) The subject's external ear will be chosen for application.

c) The chosen external ear and the anatomical location of the generatorplacement distal to the ear will be cleaned with an astringent to removeany surface oils or debris. Furthermore, the subject's external ear andthe generator location may be disinfected by alcohol pads.

d) The location of the auricular neurovascular bundles will be firstvisualized by the clinician using the transilluminator per protocol.

e) The electrode/needle array connected to the lead wires arepercutaneously implanted into the proper anatomical location being sureto penetrate the skin so implantation is percutaneous within 1 mm of thechosen neurovascular bundles.

f) The duration of treatment is 120 hours.

In one embodiment, the electrically erasable programmable read-onlymemory (EEPROM) is updated each minute to ensure the unit repeats thepulse train for 2 hours, follows with a 2 hour low power delay cyclewith no pulse output, then repeats the pulse and delays for a total of120 hours regardless. EEPROM ensures run time data and the currentaction of the state machine are saved even if power is removed from theboard. After 120 hours, all interrupts and timers are disabled and unitis allowed to go into an endless sleep state-effectively disabling theunit permanently.

The actual location and determination of needle placement (calledpoints) is based upon tradition and theory of acupuncture. While theascribed “points” may vary, depending upon the type of acupuncture towhich one prescribes, the rationale and needle placement varies littleand the theory is the same.

The addition of electrical stimulation to the individual, non-connectedneedles does not alter the rationale and the location of application isstill based upon the original theory. The addition of electricity, whileconsidered an enhancement, still falls within the realm of auricularacupuncture.

The present invention provides methods not based upon acupuncturetechnique or “points” but rather peripheral nerve field stimulation,anatomical location of cranial nerves, peripheral nerves, arterialbranches and/or neurovascular bundles, and energy transfer based uponaccepted laws of energy transfer in human tissue. Peripheral nerve fieldstimulation is an accepted procedure for the affecting of targetednerves to alter pain transmission on a local (peripheral) and CNS(central nervous system) level. PNFS is commonly used in the occipitalnerves (branches of the cervical nerves) for headache control, and thefemoral nerve of the leg for control of phantom limb pain, stump pain,and other types of peripheral pain. The PNFS technique is based uponneuro-anatomy, blood vessel anatomy, proximity of the electrodes to theactual nerves being stimulated, and verification of electrode proximity.

Without wishing to be bound by theory, the method of auricularapplication of PNFS relies on the fact that located within the ear arecranial nerves V, VII, IX, X which anastomose (connect) directly intothe brain and branches of the greater and lesser occipital nervesanastomosing directly into the cervical spine. There are distinct areasof the auricle on both the dorsal and ventral aspect which carry apredominance/concentration of the cranial nerves, peripheral nerves,arterial branches, and neurovascular bundles.

Branches of the superior temporal artery and the posterior auricularartery are found within the external ear, entering from the anterior(ventral) and posterior (dorsal) aspect of the ear. These arteriesconverge in the lobe, branching eventually into the cellular levelforming a complex, interconnecting network branching according toMandelbrot's set.

These physical entities can be selectively targeted by percutaneousimplantation of one or more electrode/needle complex(s) either with asingle needle or an array connected to a generator set at a selectedfrequency or modulating frequency range.

The nerves and arteries converge into neurovascular bundles.Visualization of the bundles can be achieved by transillumination of theear, ultrasonic imaging or other techniques used to visualize or inferthese particular kinds of anatomy.

Application of these procedures, it's rationale, and verification areunique to our technique and varies from the previously held concepts ofauricular acupuncture in the following manner:

a) The verification of the bundles is ascertained by physical anatomyand visualization.

b) There are anatomical areas, which have concentrations of the cranialnerves and arterial branches but no set “points” to learn and follow.Location of placement of the electrode/needle complex must beindividualized and is not “pre set”.

c) The theory is based on neurovascular stimulation and targetedstimulation of the cranial nerves or peripheral nerves, not acupuncturepoints (chi, hot/cold, or reflex points).

This is accomplished due to the thickness of the tissue of the externalear is thin enough that a focused light (transilluminator) can passthrough the tissue (transillumination). Also, there is a difference indensity between the auricular tissues and the auricular neurovascularbundles allowing the bundles to be visualized and outlined. Finally,both measurement of the rate of arterial blood flow and the vesselanatomy can be visualized and isolated using ultra sonic imaging andother techniques used to directly visualize neurovascular or vasculartissues.

The electrode/needle complex(s) are implanted percutaneously tostimulate the arterial branches, the cranial nerves, peripheral nervesand the neurovascular bundles. There is a natural tissue resistance toelectricity. The implantation must be within 2 mm of the nerve andvascular tissue to have an effect. The implanted needle cannot bedirectly into an arterial branch. Percutaneous implantation of one ormore needle/electrode complex(s) or an array beyond the capability ofthe tissue to transfer the electricity will cause tissue damage and painwith little or no energy transfer to the neurovascular bundles, arterialbranches, peripheral or cranial nerves. Percutaneous implantation of aneedle or needle/array directly into a main arterial branch will causepain and bleeding. This application technique/method and energy transferis based on both Coulomb's law and Ohm's law.

The verification of the cranial nerves, peripheral nerves, arterialbranches, and neurovascular bundles are ascertained by anatomy andvisualization. There are anatomical areas (zones), which havepredictable and reproducible concentrations of the cranial nerves,peripheral nerves, arterial branches, and neurovascular bundles but noset “points” to learn and follow. Electrode/needle implantation must bewithin parameters of the electrode design, generator design, and tissueresistance as determined by Coulomb's and Ohm's laws. The combination ofthe understanding of anatomy, visualization, and proper percutaneousimplantation of the needle/electrode array will determine propertransfer of the electricity into the neurovascular bundles. Withoutusing this unique method, the electrode/needle implantation into theauricle is not accurate.

In one embodiment, the application method can be performed as follows:

Clean off the skin of the dorsal and ventral of the ear with anastringent. This removes surface oils, make up, etc. which may interferewith implantation and energy transfer from the generator.

Using a transilluminator, ultrasonic imaging, or other visualizationtechniques, the area (zone) into which there is a concentration ofcranial nerves, occipital nerves, neurovascular bundles, and branches ofthe superficial temporal and posterior auricular arteries are targetedas per our guidelines. Choose the area that corresponds to theneuroanatomy, which is to be targeted.

In one embodiment, transillumination technique can be performed asfollows:

a) Place the lighted, optic tip of the transillumination device directlyagainst the skin on the ventral or dorsal aspect of the ear at 90degrees so the concentrated light passes through the tissue. The lightcan be a direct, focused light or an array of lights of any colorspectrum. Since the light passes through the tissue and the auriculartissue has a different density than the neurovascular bundles, this willin essence outline the arterial branches and the neurovascular vascularbundles so they can be seen.

b) Implant the needle/electrode complex(s) percutaneously within 2 mm ofthe neurovascular bundles (as visualized) but not directly into anarterial branch by placing the needle into the skin at 90 degrees fromeither the dorsal or ventral aspect of the ear depending upon which ofthe cranial nerves, occipital nerves, neurovascular bundles, or arterialbranches are to be targeted. The needle should not be inserted directlyinto a main arterial branch. The needle must pass through the outerdermis to be classified as percutaneous. Placing any type of stimulationto the outer skin without complete skin penetration is consideredtranscutaneous.

c) Verification of correct placement is by determined by patients notingthe pulsing of the electricity, and/or enlarging of the associatedarteries by unaided visual inspection. In one embodiment, the methodfurther comprises following up with transillumination as per describedprotocol to help verify arterial reaction. In another embodiment, themethod further comprises measurement of an increase in blood flow, asmeasured or determined by any method or device.

All publications, patents and patent applications cited herein, whethersupra or infra, are hereby incorporated by reference in their entiretyto the same extent as if each individual publication, patent or patentapplication was specifically and individually indicated as incorporatedby reference. It should be appreciated that any patent, publication, orother disclosure material, in whole or in part, that is said to beincorporated by reference herein is incorporated herein only to theextent that the incorporated material does not conflict with existingdefinitions, statements, or other disclosure material set forth in thisdisclosure. As such, and to the extent necessary, the disclosure asexplicitly set forth herein supersedes any conflicting materialincorporated herein by reference. Any material, or portion thereof, thatis said to be incorporated by reference herein, but which conflicts withexisting definitions, statements, or other disclosure material set forthherein, will only be incorporated to the extent that no conflict arisesbetween that incorporated material and the existing disclosure material.

It must be noted that, as used in this specification and the appendedclaims, the singular forms “a,” “an” and “the” include plural referentsunless the content clearly dictates otherwise. Thus, for example,reference to a “colorant agent” includes two or more such agents.

Unless defined otherwise, all technical and scientific terms used hereinhave the same meaning as commonly understood by one of ordinary skill inthe art to which the invention pertains. Although a number of methodsand materials similar or equivalent to those described herein can beused in the practice of the present invention, the preferred materialsand methods are described herein.

As will be appreciated by one having ordinary skill in the art, themethods and compositions of the invention substantially reduce oreliminate the disadvantages and drawbacks associated with prior artmethods and compositions.

It should be noted that, when employed in the present disclosure, theterms “comprises,” “comprising,” and other derivatives from the rootterm “comprise” are intended to be open-ended terms that specify thepresence of any stated features, elements, integers, steps, orcomponents, and are not intended to preclude the presence or addition ofone or more other features, elements, integers, steps, components, orgroups thereof.

As required, detailed embodiments of the present invention are disclosedherein; however, it is to be understood that the disclosed embodimentsare merely exemplary of the invention, which may be embodied in variousforms. Therefore, specific structural and functional details disclosedherein are not to be interpreted as limiting, but merely as a basis forthe claims and as a representative basis for teaching one skilled in theart to variously employ the present invention in virtually anyappropriately detailed structure.

While it is apparent that the illustrative embodiments of the inventionherein disclosed fulfill the objectives stated above, it will beappreciated that numerous modifications and other embodiments may bedevised by one of ordinary skill in the art. Accordingly, it will beunderstood that the appended claims are intended to cover all suchmodifications and embodiments, which come within the spirit and scope ofthe present invention.

What is claimed is:
 1. An auricular peripheral nerve field stimulator,comprising: at least one therapy electrode configured for percutaneousinsertion into an auricle of a human ear near at least one neurovascularbundle located therein, and an electrical stimulation deviceelectrically coupled to the electrical stimulation device, theelectrical stimulation device programmed to generate and deliverelectrical stimulation signals, with defined stimulation parameters, tothe percutaneously inserted at least one therapy electrode to stimulateat least one auricular peripheral nerve field within the auricle, thedefined stimulation parameters including a defined signal amplitude, adefined pulse frequency, a defined pulse width, a defined duty cycle anda defined stimulation signal duration.
 2. The auricular peripheral nervefield stimulator of claim 1, wherein the defined stimulation parametersinclude a defined signal repetition frequency.
 3. The auricularperipheral nerve field stimulator of claim 1, further comprising meansfor attaching the housing to or adjacent to the human ear.
 4. Theauricular peripheral nerve field stimulator system of claim 1, furthercomprising one of a battery and an accumulator electrically coupled tothe electrical stimulation device to supply the electrical stimulationdevice with electrical energy.
 5. The auricular peripheral nerve fieldstimulator of claim 1, further comprising a remote control device,wherein operation of the electrical stimulator device is controllablevia the remote control device.
 6. The auricular nerve field stimulationdevice of claim 1, wherein the defined signal amplitude is a constantcurrent amplitude.
 7. The auricular nerve field stimulation device ofclaim 1, further comprising a reference electrode electrically coupledto the electrical stimulation device and configured for percutaneousinsertion into a skin surface of or near the human ear, the referenceelectrode providing a reference for the electrical stimulation signals.8. The auricular nerve field stimulation device of claim 2, wherein thedefined stimulation parameters include a total therapy duration duringwhich the electrical stimulation signals are generated and delivered bythe electrical stimulation device.
 9. The auricular nerve fieldstimulation device of claim 1, wherein the at least one therapyelectrode includes at least one needle for percutaneous insertion intothe auricle.
 10. The auricular nerve field stimulation device of claim1, wherein the at least one therapy electrode comprises a plurality oftherapy electrodes each electrically coupled to the electricalstimulation device and each including at least one needle forpercutaneous insertion into the auricle.
 11. A method for auricularperipheral nerve field stimulation, the method comprising: locating atleast one auricular neurovascular bundle within an auricle of a humanear, percutaneously inserting at least one needle, carried by at leastone therapy electrode, into the auricle near the at least one locatedauricular neurovascular bundle, electrically coupling an electricalstimulation device to the at least needle of the at least one therapyelectrode, and controlling the electrical stimulation device to generateand deliver electrical stimulation signals, with defined stimulationparameters, to the percutaneously inserted at least one therapyelectrode to stimulate at least one auricular peripheral nerve fieldwithin the auricle, the defined stimulation parameters including adefined signal amplitude, a defined pulse frequency, a defined pulsewidth, a defined duty cycle and a defined stimulation signal duration.12. The method of claim 11, wherein the defined stimulation parametersinclude a defined signal repetition frequency.
 13. The method of claim11, wherein percutaneously inserting the at least one needle carried bythe at least one therapy electrode into the auricle comprisespercutaneously inserting the at least one needle into a ventral ordorsal aspect of the auricle within about 2 mm of the locatedneurovascular bundle.
 14. The method of claim 11, further comprisingcontrolling operation of the electrical stimulation device with a remotecontrol device.
 15. The method of claim 11, wherein the defined signalamplitude is a constant current amplitude.
 16. The method of claim 11,further comprising providing a reference for the electrical stimulationsignals with a reference electrode electrically coupled to theelectrical stimulation device and configured for percutaneous insertioninto a skin surface on or near the human ear.
 17. The method of claim12, wherein the defined stimulation parameters include a total therapyduration during which the electrical stimulation signals are generatedand delivered by the electrical stimulation device.
 18. The method ofclaim 11, wherein controlling the electrical stimulation devicecomprises controlling the electrical stimulation device to generate anddeliver the electrical stimulation signals in the form of a pulse trainhaving a repetition frequency of at least one of +1 Hz, −1 Hz, +10 Hzand −10 Hz.
 19. The method of claim 11, wherein controlling theelectrical stimulation device comprises controlling the electricalstimulation device to generate and deliver the electrical stimulationsignals in the form of a pulse train having a repetition frequency ofbetween about 0.5 Hz to 100 Hz.
 20. The method of claim 11, whereinpercutaneously inserting at least one needle comprises inserting atleast one needle of each of a plurality of therapy electrodes into theauricle near one or more located auricular neurovascular bundles withinthe auricle, wherein electrically coupling an electrical stimulationdevice to the at least needle comprises electrically coupling theelectrical stimulation device to the at least one needle of each of theplurality of therapy electrodes, and wherein controlling the electricalstimulation device to generate and deliver electrical stimulationsignals to the percutaneously inserted at least one needle comprisescontrolling the electrical stimulation device to generate and deliverelectrical stimulation signals to the percutaneously inserted at leastone needle of each of the plurality of therapy electrodes.